Added extern C around function prototypes for C++ compatibility

common/wave.h

@@ -1,10 +1,19 @@
 #ifndef _INCLUDE_WAVE_H_
 #define _INCLUDE_WAVE_H_
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
     // Save signal in floating point format (-1 .. +1) as a WAVE file using 16-bit signed integers.
     void save_wav(const float* signal, int num_samples, int sample_rate, const char* path);
 
     // Load signal in floating point format (-1 .. +1) as a WAVE file using 16-bit signed integers.
     int load_wav(float* signal, int* num_samples, int* sample_rate, const char* path);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _INCLUDE_WAVE_H_

ft8/constants.h

@@ -3,11 +3,10 @@
 
 #include <stdint.h>
 
-typedef enum
+#ifdef __cplusplus
+extern "C"
 {
-    PROTO_FT4,
-    PROTO_FT8
-} ftx_protocol_t;
+#endif
 
 #define FT8_SYMBOL_PERIOD (0.160f) ///< FT8 symbol duration, defines tone deviation in Hz and symbol rate
 #define FT8_SLOT_TIME     (15.0f)  ///< FT8 slot period
@@ -50,6 +49,12 @@ typedef enum
 #define FT8_CRC_POLYNOMIAL ((uint16_t)0x2757u) ///< CRC-14 polynomial without the leading (MSB) 1
 #define FT8_CRC_WIDTH      (14)
 
+    typedef enum
+    {
+        PROTO_FT4,
+        PROTO_FT8
+    } ftx_protocol_t;
+
     /// Costas 7x7 tone pattern for synchronization
     extern const uint8_t kFT8_Costas_pattern[7];
     extern const uint8_t kFT4_Costas_pattern[4][4];
@@ -78,4 +83,8 @@ extern const uint8_t kFTX_LDPC_Mn[FTX_LDPC_N][3];
     /// Number of rows (columns in C/C++) in the array Nm.
     extern const uint8_t kFTX_LDPC_Num_rows[FTX_LDPC_M];
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _INCLUDE_CONSTANTS_H_

ft8/crc.h

@@ -4,6 +4,11 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
     // Compute 14-bit CRC for a sequence of given number of bits using FT8/FT4 CRC polynomial
     // [IN] message  - byte sequence (MSB first)
     // [IN] num_bits - number of bits in the sequence
@@ -19,4 +24,8 @@ uint16_t ftx_extract_crc(const uint8_t a91[]);
     /// @param[out] a91 91 bits of payload data + CRC
     void ftx_add_crc(const uint8_t payload[], uint8_t a91[]);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _INCLUDE_CRC_H_

ft8/decode.h

@@ -6,6 +6,11 @@
 
 #include "constants.h"
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
     /// Input structure to ft8_find_sync() function. This structure describes stored waterfall data over the whole message slot.
     /// Fields time_osr and freq_osr specify additional oversampling rate for time and frequency resolution.
     /// If time_osr=1, FFT magnitude data is collected once for every symbol transmitted, i.e. every 1/6.25 = 0.16 seconds.
@@ -71,4 +76,8 @@ int ft8_find_sync(const waterfall_t* power, int num_candidates, candidate_t heap
     /// @return True if the decoding was successful, false otherwise (check status for details)
     bool ft8_decode(const waterfall_t* power, const candidate_t* cand, message_t* message, int max_iterations, decode_status_t* status);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _INCLUDE_DECODE_H_

ft8/encode.h

@@ -3,6 +3,11 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
     // typedef struct
     // {
     //     uint8_t tones[FT8_NN];
@@ -29,4 +34,8 @@ void ft8_encode(const uint8_t* payload, uint8_t* tones);
     /// @param[out] tones  - array of FT4_NN (105) bytes to store the generated tones (encoded as 0..3)
     void ft4_encode(const uint8_t* payload, uint8_t* tones);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _INCLUDE_ENCODE_H_

ft8/ldpc.h

@@ -3,6 +3,11 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
     // codeword is 174 log-likelihoods.
     // plain is a return value, 174 ints, to be 0 or 1.
     // iters is how hard to try.
@@ -11,4 +16,8 @@ void ldpc_decode(float codeword[], int max_iters, uint8_t plain[], int* ok);
 
     void bp_decode(float codeword[], int max_iters, uint8_t plain[], int* ok);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _INCLUDE_LDPC_H_

ft8/pack.h

@@ -3,9 +3,18 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
     // Pack FT8 text message into 72 bits
     // [IN] msg      - FT8 message (e.g. "CQ TE5T KN01")
     // [OUT] c77     - 10 byte array to store the 77 bit payload (MSB first)
     int pack77(const char* msg, uint8_t* c77);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _INCLUDE_PACK_H_

ft8/text.h

@@ -4,6 +4,11 @@
 #include <stdbool.h>
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
     // Utility functions for characters and strings
 
     const char* trim_front(const char* str);
@@ -34,4 +39,8 @@ void int_to_dd(char* str, int value, int width, bool full_sign);
     char charn(int c, int table_idx);
     int nchar(char c, int table_idx);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _INCLUDE_TEXT_H_

ft8/unpack.h

@@ -3,6 +3,11 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
     // field1 - at least 14 bytes
     // field2 - at least 14 bytes
     // field3 - at least 7 bytes
@@ -11,4 +16,8 @@ int unpack77_fields(const uint8_t* a77, char* field1, char* field2, char* field3
     // message should have at least 35 bytes allocated (34 characters + zero terminator)
     int unpack77(const uint8_t* a77, char* message);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // _INCLUDE_UNPACK_H_